<p>Florida Highway Patrol troopers are trying to identify a pedestrian who was struck and seriously injured while walking on a highway in north Marion County early Saturday morning.</p><p>Officials said the driver of a 2005 Ford Expedition, Monica K. Mitchell, 27, of Gainesville, was heading north on U.S. 441/U.S. 301 in the outside lane, approaching County Road 329.</p><p>The unknown pedestrian was walking in the northbound outside lane of U.S. 301, north of the intersection.</p><p>The Ford traveled through the intersection at CR 329, and Mitchell, upon seeing the pedestrian, attempted to stop. The vehicle's left front struck the man.</p><p>The man was transported to UF Health Shands Hospital in Gainesville with life-threatening injuries.</p><p>At this point, officials said it doesn't appear that speed or alcohol was a factor on the part of the driver.</p><p>The accident occurred at 1:55 a.m.</p>